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The triple helix model of innovation, as theorized by Etzkowitz and Leydesdorff, is based on the interactions between the three following elements and their associated 'initial role': [9] universities engaging in basic research, industries producing commercial goods and governments that are regulating markets. [2]
The quadruple and quintuple innovation helix framework describes university-industry-government-public-environment interactions within a knowledge economy.In innovation helix framework theory, first developed by Henry Etzkowitz and Loet Leydesdorff [1] [2] and used in innovation economics and theories of knowledge, such as the knowledge society and the knowledge economy, each sector is ...
The term "unitary executive" dates back to the Reagan administration, [2] [35] [36] [37] but supporters of the unitary executive theory, sometimes referred to as "unitarians", contend the principle dates to the founding. [38]
A Boerdijk helical sphere packing has each sphere centered at a vertex of the Coxeter helix. Each sphere is in contact with 6 neighboring spheres. The Boerdijk–Coxeter helix, named after H. S. M. Coxeter and Arie Hendrick Boerdijk [], is a linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices.
The mathematical statement of the three-body problem can be given in terms of the Newtonian equations of motion for vector positions = (,,) of three gravitationally interacting bodies with masses :
The Wheeler–Feynman absorber theory (also called the Wheeler–Feynman time-symmetric theory), named after its originators, the physicists Richard Feynman and John Archibald Wheeler, is a theory of electrodynamics based on a relativistic correct extension of action at a distance electron particles.
The helix of sustainability - the Carbon cycle ideal for manufacture and use The international recycling symbol - not nature identical.. The helix of sustainability is a concept coined to help the manufacturing industry move to more sustainable practices by mapping its models of raw material use and reuse onto those of nature.
The collagen triple helix is a triple helix formed from three separate protein helices, spiraling around the same axis. In the fields of geometry and biochemistry, a triple helix (pl.: triple helices) is a set of three congruent geometrical helices with the same axis, differing by a translation along the axis.